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package com.sun.grizzly.http.jk.common;

import com.sun.grizzly.http.jk.core.JkHandler;
import com.sun.grizzly.http.jk.core.Msg;
import com.sun.grizzly.http.jk.core.MsgContext;
import com.sun.grizzly.util.LoggerUtils;
import java.io.IOException;

import java.util.logging.Level;

/**
 * Dispatch based on the message type. ( XXX make it more generic,
 * now it's specific to ajp13 ).
 * 
 * @author Costin Manolache
 */
public class HandlerDispatch extends JkHandler {

    public HandlerDispatch() {
    }

    public void init() {
    }
    JkHandler handlers[] = new JkHandler[MAX_HANDLERS];
    String handlerNames[] = new String[MAX_HANDLERS];
    static final int MAX_HANDLERS = 32;
    static final int RESERVED = 16;  // reserved names, backward compat
    int currentId = RESERVED;

    public int registerMessageType(int id, String name, JkHandler h,
            String sig[]) {
        if (LoggerUtils.getLogger().isLoggable(Level.FINEST)) {
            LoggerUtils.getLogger().log(Level.FINEST, "Register message " + id + " " + h.getName() +
                    " " + h.getClass().getName());
        }
        if (id < 0) {
            // try to find it by name
            for (int i = 0; i < handlerNames.length; i++) {
                if (handlerNames[i] == null) {
                    continue;
                }
                if (name.equals(handlerNames[i])) {
                    return i;
                }
            }
            handlers[currentId] = h;
            handlerNames[currentId] = name;
            currentId++;
            return currentId;
        }
        handlers[id] = h;
        handlerNames[currentId] = name;
        return id;
    }

    // -------------------- Incoming message --------------------
    public int invoke(Msg msg, MsgContext ep)
            throws IOException {
        int type = msg.peekByte();
        ep.setType(type);

        if (type > handlers.length ||
                handlers[type] == null) {
            if (LoggerUtils.getLogger().isLoggable(Level.FINEST)) {
                LoggerUtils.getLogger().log(Level.FINEST, "Invalid handler " + type);
            }
            return ERROR;
        }

        if (LoggerUtils.getLogger().isLoggable(Level.FINEST)) {
            LoggerUtils.getLogger().log(Level.FINEST, "Received " + type + " " + handlers[type].getName());
        }

        JkHandler handler = handlers[type];

        return handler.invoke(msg, ep);
    }
}
